In my timeline 'After Actium' a resurgent Greco-Bactrian empire has established itself from the Hindu Kush and Punjab to Chorasmia on the Caspian and Gedrosia along Persian Gulf. It also holds a couple of Arab ports. I want to know
1) if it would be possible to expand along the Silk Road into Kansu, cross over into the Tibetan plateau, defeat the Xiognu and conquer India north of the Deccan?
2) what cultural, religious, economic effects would such an empire have, even if lasting a single generation?